fix: Use root-binaries conda-forge package as build base (#5)

* Base build around conda-forge 'root-binaries' to get ROOT runtime
* Add checks to build CI for ROOT, hist2workspace, and common utilities

.github/workflows/ci.yml

@@ -22,6 +22,10 @@ jobs:
           --tag pyhf/pyhf-validation-root-base:$GITHUB_SHA \
           --compress
         docker images
+    - name: Check PATH
+      run: |
+        docker run --rm pyhf/pyhf-validation-root-base:$GITHUB_SHA -c "which python;python --version;which root;root-config --version;hist2workspace --help"
+        docker run --rm pyhf/pyhf-validation-root-base:$GITHUB_SHA -c "which curl;which tar"
     - name: Run tests
       run: |
         docker run --rm -v $PWD:$PWD -w $PWD pyhf/pyhf-validation-root-base:$GITHUB_SHA -c "python tests/rf308_normintegration2d.py"

Dockerfile

@@ -12,17 +12,19 @@ RUN conda config --add channels conda-forge && \
     conda config --set allow_softlinks false && \
     conda config --set always_copy true
 RUN conda create --yes --quiet -p /opt/condaenv \
-  "root_base=$ROOT_VERSION" \
+  "root-binaries=$ROOT_VERSION" \
   "python=$PYTHON_VERSION"
 # Forcibly remove some packages to make the final image smaller
 # c.f. https://github.com/conda-forge/root-feedstock/blob/master/recipe/meta.yaml
 RUN eval "$(python -m conda shell.bash hook)" && \
     conda activate /opt/condaenv && \
-    conda install -y \
-      libblas \
-      libcblas \
-      fftw \
-      zlib
+    conda remove --yes --force-remove \
+      pythia8 \
+      qt \
+      libllvm9 \
+      libclang \
+      pandoc \
+      xrootd
 RUN rm -rf /opt/condaenv/tutorials /opt/condaenv/ui5
 
 FROM base